133results about How to "Low residue content" patented technology

The invention discloses a cross-linking agent for a low concentration guanidine gum pressing crack system, comprising the following raw materials by weight: 12.5-20 parts of glycerol, 10-15 parts of borax, 4-6 parts of sodium gluconate, 1.5-2 parts of sodium hydroxide, 0-4 parts of inorganic zirconate, 0-4 parts of triethanolamine, and 49-68 parts of water. The invention further discloses a preparation technology. The beneficial effects comprise that: the cross-linking agent for a pressing crack liquid can substantially raise the usage efficiency of the guanidine gum, greatly reduces a usage amount of the guanidine gum; and in same case, the concentration of the guanidine can reduce 30-50%, the content of the guanidine gum residue reduces more than 30%, and a rock core damage rate relatively reduces more than 20%. The cross-linking agent prepared in the invention has same application with the current cross-linking agent, and accordingly it is convenient for on-site construction.

The invention discloses clean carbon dioxide foam fracturing fluid and a preparation method thereof, and relates to the technical field of oilfield chemistry and fracturing production increase. The carbon dioxide foam fracturing fluid is mainly composed of a base solution, a foaming agent, a gel breaker and liquid carbon dioxide with the mass ratio being 100 to 0.15-0.45 to 0.02-0.08 to 100-900. The base solution is formed by 0.2%-0.55% of a thickening agent and water. The thickening agent is mainly formed by bisacrylamide, vinyl pyrrolidone, kation unsaturated monomer, anion unsaturated monomer, an initiator, sodium carbonate, an emulsifying agent and a hydrotropy agent. The foaming agent is mainly formed by hexadecyl dimethyl tertiary amine, dimethyl sulfate, caustic soda flakes, potassium persulfate and solvent. The clean carbon dioxide foam fracturing fluid has the advantages of being high in foam stability, high in temperature resistance and shear resistance, high in sand-carrying performance, wide in applicable temperature range, extremely low in residue content, high in backflow performance, and small in secondary damage to a reservoir after fracturing, thereby improving the fracturing effect and increasing the reservoir productivity.

The invention relates to a fracturing fluid capable of resisting high salinity water quality. The fracturing fluid is characterized by being composed of a base fluid and a cross-linking fluid which are fully mixed in proportion. The base fluid contains a chelate cosolvent and a chelate stabilizer, wherein the chelate cosolvent can restrain high salinity of water quality and promote swelling of guanidine gum. The base fluid comprises 98.2-98.65 parts of high salinity surface water, 0.1-0.15 part of the chelate cosolvent,0.3-0.4 part of thickener, 0.1-0.15 part of bactericide, 0.3-0.5 part of clay stabilizer, 0.5 part of demulsifying cleanup agent and 0.05-0.1 part of the chelate stabilizer; the cross-linking fluid comprises 50 parts of water, 50 parts of organic cross-linking agents and 0.35 part of gel breaker; and the fracturing fluid comprises 99.2-99.5 parts of the base fluid and 0.5-0.8 part of the cross-linking fluid. By aid of the fracturing fluid, water resources can be saved effectively, and the success rate for fracturing construction can be improved.

The invention discloses a high-temperature-resistance low-friction weighted clean fracturing fluid which is suitable for high-temperature and high-pressure reservoir reconstruction at 170 DEG C and a preparation method thereof.The fracturing fluid is prepared from, by weight, 0.2%-0.8% of high-temperature-resistance thickening agent, 0.1%-0.8% of system synergist, 0.1%-0.3% of high temperature stabilizer, 0%-42% of weighting agent and the balance fresh water.The high-temperature-resistance low-friction weighted clean fracturing fluid has the following functions and advantages that the weighting agent can be adopted for weighting, and the density is adjustable between 0 and 1.32 g/cm<3>; good temperature-resistance and anti-shearing properties are achieved, and the requirement of high-temperature deep well fracturing construction at 170 DEG C can be met by adjusting a formula; a good resistance reduction property is achieved, pipeline friction resistance can be effectively reduced, and the resistance reduction rate can reach 70%; the fracturing fluid is a fluid with a reversible structure, and the structure damage after high shearing is small; the residue content of the fracturing fluid is decreased to below 10 mg/L, damage to a reservoir and supporting cracks is reduced, the fracturing effect is improved, and the reservoir productivity is increased.

The invention provides a fracturing fluid thickening agent, prepared by modifying galactomannan compounds with ion etherification under alkaline conditions, wherein the ion etherification substitution degree is 0.01-0.45. The invention also provides a fracturing fluid containing the thickening agent. The thickening agent used for vegetable gelatin fracturing is instant, and has the advantages of strong tackifying capability, temperature tolerance, salt resistance, anti-shearing performance, and low residue amount.

The present invention relates to an improvement on oil-field water base fracture fluid formula. Said water base fracture liquid is composed of base fluid and cross-linking liquor according to a certain ratio. Said base fluid is formed from (by wt%) 0.25-0.40% of thickness agent, 0.15-0.30% of cleanup additive, 0.10-0.20% of emulsion-breaking emulsion preventer, 1.0-2.0% of antiswelling agent, 0.10-0.20% of clay stabilizing agent, 0.1-0.15% of vegetable gun stabilizing agent and 96.65-98.3% of water, and the cross-linking liquor is formed from 3.0-6.0% of cross-linking agent, 0.4-1.2% of breaking agent and 92.8-96.6% of water, and the volume ratio of base fluid and cross-linking liquor is 20-50:1. Said invention can effectively improve fracture fluid properties, and its damage to reservoir permeability and fracture conductivity can be minimum.

The invention relates to a fracturing fluid capable of resisting low pH value environment and higher salinity and a preparation method thereof. Most conventional fracturing fluid can have favorable viscoelasticity only in an alkaline environment, and the natural vegetable glue used under normal conditions is difficulty for crosslinking under acidic conditions. The preparation method comprises the following steps: uniformly mixing a viscoelastic surfactant, an acid and a dispersion pour-point depressant to form a liquid component mixture; and dissolving a water-soluble nonionic polymer thickener at normal temperature, adding the liquid component mixture, and stirring uniformly to obtain the fracturing fluid. Under the condition of not using any crosslinking agent, the vermiform accumulation of the viscoelastic surfactant is utilized to coat the linear high-polymer part inside the viscoelastic surfactant, so that the linear high polymer generates the crosslinking-like effect due to the existence of the viscoelastic surfactant when meeting the acid and shrinking. The fracturing fluid has high viscosity in a neutral environment due to the linear high polymer, and thus, can not have the solid carrying capacity due to greatly lowered viscosity under acidic conditions.

The invention provides high-temperature-resistant ground cross-linked acid liquor. The acid liquor comprises the following components in percentage by mass: 15-28 weight percent of acid, 0.4-1.0 weight percent of polyacrylamide polymer, 0.1-0.5 weight percent of aldehyde cross-linking agent, 0.05-0.25 weight percent of phenol cross-linking agent, 0.05-0.02 weight percent of crosslinking promoter, 0.5-2.0 weight percent of corrosion inhibitor, 0.5-2.0 weight percent of ferric ion stabilizer, 0.01-0.1 weight percent of ammonium persulfate and the balance of water, wherein the acid is calculated based on pure substances. The invention also provides a method for preparing the high-temperature-resistant ground cross-linked acid liquor. Industrial raw materials which are low in toxicity and low in price are taken as cross-linking agents and cross-linking promoter, the toxicity of the cross-linking agents can be reduced, the process for preparing the high-temperature-resistant ground cross-linked acid liquor is simple, further synthesis is not needed, the field operability is high, the cost is effectively reduced, and application of acid fracturing is further widened.

The invention relates to a high-temperature water base fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following additives by weight: 0.45-1.0% of a thickening agent, 0.6-1.5% of a clay stabilizer, 0.6-1.5% of an emulsion breaking cleanup additive, 0.01-0.03% of a gel breaking agent, 0.6-2.0% of a crosslinking agent and the balance of sea water, wherein the total sum weight percentages of the components is 100%. The fracturing fluid has the advantages of good sand carrying capability, good heat resistant and shearing resistant performances, good compatibility with formation fluid and small reservoir damage; seawater can be used directly to prepare the solution; and conventional liquid dispensing equipment and process are employed to solve the problem of lack of freshwater in offshore fracturing construction. The invention improves working efficiency of offshore fracturing, reduces the cost, and lays the foundation for the large-scale offshore fracturing operation.

The invention provides an organic titanium crosslinking agent, and a preparation method and application method thereof. The preparation method comprises the following steps: adding 90-110 parts by mass of tetrabutyl titanate into a reactor, heating to 60-80 DEG C, adding 70-90 parts of triethanolamine into the reactor while stirring, reacting for 30-60 minutes, adding 70-90 parts of glycerol, and reacting at 60-80 DEG C for 150-200 minutes. The application method comprises the following steps: mixing the organic titanium crosslinking agent with an organic boron crosslinking agent to obtain a mixture, adding the mixture into a 0.3 wt% guar gum solution or konjak gum solution, and stirring to obtain a fracturing fluid. The fracturing fluid prepared from the organic titanium crosslinking agent and organic boron crosslinking agent has the advantages of high temperature tolerance, high shearing resistance, low residue content and small damage to the stratum after viscosity breaking, and the like.

The invention provides water base guanidine gum fracturing fluid, and belongs to the field of oil field fracturing technologies. The water base guanidine gum fracturing fluid comprises the following ingredients: guanidine gum derivative, cross-linking agents, gel breakers, thickening agents, PH value adjusting agents and water. The invention further provides a water base guanidine gum fracturing fluid preparation method. The method includes the following steps of (1) dissolving gelatinizing agents in the water, evenly mixing, and obtaining thickened water; (2) dissolving the cross-linking agents in the water, evenly mixing and obtaining cross-linking agent water solution; (3) adjusting the PH value of the thickened water to 9-10, then slowly adding the cross-linking agent water solution into the thickened water to obtain jelly solution; (4) and adding the thickening agents into the jelly solution, and finally adding the gel breakers to obtain the water base guanidine gum fracturing fluid. The water base guanidine gum fracturing fluid is low in sludge content after gel breaking, and meanwhile the cost of the water base guanidine gum fracturing fluid is greatly reduced.

The invention provides a multifunctional composite fracturing liquid system. The multifunctional composite fracturing liquid system comprises resistance reduction water and high-viscosity sand carrying liquid, wherein the resistance reduction water comprises 0.02 to 0.15 percent by weight of the resistance reduction agent; the high-viscosity sand carrying liquid comprises 0.2 to 0.75 percent by weight of a thickening agent; the resistance reduction agent and the thickening agent are identical aggregation polymer and are natural modified aggregation polymer and/or organic synthetic aggregation polymer. The low-concentration aggregation polymer having good resistance reduction performance and the high-concentration aggregation polymer having good sand carrying performance are used for forming the multifunctional composite fracturing liquid system; compared with the existing composite fracturing liquid system, the multifunctional composite fracturing liquid system has characteristics of fewer types of additives, simple formula and simple preparation process; meanwhile, the system has good resistance reduction performance, shear resistance and sand carrying performance; return liquid of the system can be reused after being treated in a way such as flocculating, precipitating and filtering, and the utilization rate of water for fracturing is increased.

The invention discloses a guanidine gum fracturing fluid system. The system comprises a base solution and a cross-linking agent, wherein the weight ratio between the cross-linking agent and the base solution is 0.3-0.8%, the base solution comprises 0.2-0.45% of modified guanidine gum thickening agents, 0.15-0.2% of efficient discharge aiding agents, 0.2-0.5% of efficient clay stabilizers, 0.05-0.1% of bactericides, 0.05-0.15% of efficient gel breakers, and the balance water, and the sum of the weight percentages of all the constituents is 100%. By the adoption of the system, usage mount of guanidine gum is reduced, and therefore residue rate is small, reservoir damage is light, and reservoir protection is facilitated.

The invention discloses a preparation method of a potassium persulfate microcapsule gel breaker. The method includes: (1) preparing a 5-20 mass% gelatin solution; (2) under 45DEG C constant temperature and constant speed stirring, measuring liquid paraffin into a three-mouth flask, adding a stabilizer, and mixing the substances evenly into a continuous phase medium; (3) weighing potassium persulfate powder and slowly adding it into the continuous phase medium, conducting 45DEG C constant temperature water bath stirring to disperse the substances evenly so as to form a stable suspension system; (4) slowly adding the gelatin solution into the suspension system, conducting 45DEG C constant temperature stirring at a uniform speed to form a stable latex solution; (5) transferring the latex solution into ice bath to performing constant speed stirring, adding a dehydrating agent isopropanol and a crosslinking agent formaldehyde; and (6) removing the upper oil phase, and subjecting the lower solid microcapsule to washing, pumping filtration and drying. The method provided by the invention has reliable principle and is easy to operate, the prepared microcapsule gel breaker has good sphericity, uniform and controllable particle size distribution, high effective content, and slow-release property, can be used for gel breaking of oil field water-based fracturing fluid, and has broad market prospect.

The invention relates to guar gum cleaning fracturing fluid with micro residue and weak damage. The guar gum cleaning fracturing fluid with micro residue and weak damage is composed of base liquid, a cross-linking agent and a gel breaker, the base liquid is composed of hydroxypropyl guar gum, a cleanup additive, an anti-swelling stabilizing agent, a fracturing bactericide, a fracturing de-emulsifier, a scale inhibitor and water. According to the invention, a guar gum multinucleated cross-linking agent with low amount is used, delay crosslinking effect is strong, guar gum concentration is greatly reduced, glue breaking residue amount is reduced, a multifunctional scale inhibitor is cooperated for preventing fouling generated by water used for fracturing liquid and stratum water, a selective polymer fracturing catalyst capable of thoroughly breaking glue and no generating sulfate radical is selected, liquid viscosity and residue content are reduced, the surface tension of the gel breaker after gel is broken is lower, the gel breaker is easily discharged, the formed guar gum multinucleated cross-linking agent has good temperature and shearing sustainability, and excellent proppant carrying capacity.

The invention relates to a vegetable gelatin fracturing fluid and a preparation method thereof. The fracturing fluid used by the oil field at present mostly adopts hydroxypropyl guar gum as a thickening agent, and has high cost. The preparation method for the vegetable gelatin fracturing fluid comprises the following steps of: reacting water, glycerol and borax to obtain an organic-boron cross-linking agent; reacting butyl titanate, triethanolamine and glycerol to obtain an organic titanium high-temperature stabilizer; mixing water with konjac glucomannan to obtain a base solution; and adding the organic-boron cross-linking agent and the organic titanium high-temperature stabilizer to prepare the vegetable gelatin fracturing fluid. The fracturing fluid provided by the invention adopts the konjac glucomannan as the thickening agent which has good viscosity and temperature and shearing resistance, adopts the self-prepared organic-boron cross-linking agent which has high cross-linking density and strength, and is additionally added with the organic titanium high-temperature stabilizer, so that the konjac glucomannan fracturing fluid has good temperature and shearing resistance. Moreover, the content of the rubber-crushed residues is extremely low, and the damage degree to the earth surface is extremely low.

The invention discloses a quick-dissolving type seawater-based high-temperature fracturing fluid. The quick-dissolving type seawater-based high-temperature fracturing fluid is prepared by, by weight percentage, 1.0-2.5% of emulsion type thickening agent, 0.5-2.0% of crosslinking agent, 0.05-0.1% of phase inversion agent, 0.4-1.6% of discharge-aiding agent, 0.3-0.8% of clay stabilizer, 0.01-0.03% of gel breaker and the balance seawater, wherein the sum of the weight percentage of the components is 100%. The quick-dissolving type seawater-based high-temperature fracturing fluid has the advantages that the fracturing fluid is excellent in high temperature resistance and shearing resistance, capable of satisfying the construction technological requirements of offshore high-temperature reservoir fracturing transformation of at least 1800 DEG C, outstanding in high-temperature rheological property, stable in shearing resistance and beneficial to sand-carrying fracture making; the emulsion type thickening agent is fast in dissolving and can be prepared and used on site, and the offshore fracturing transformation construction is facilitated greatly.

The invention provides a weighted fracturing fluid. The weighted fracturing fluid is a liquid system prepared by using the following raw materials, by weight, 29-70.5 parts of a weighting agent, 0.2-0.8 parts of a vegetable glue thickener, 0.1-0.8 parts of a cleanup additive, 0.02-0.15 parts of a bactericide, 0.05-0.3 parts of a pH value adjusting agent, 0.1-0.7 parts of a cross-linking agent, 0.03-0.2 parts of a gel breaker and 29.5-71 parts of water. The density of the fracturing fluid at room temperature is 1.22-1.62g/cm<3> or more; the temperature resistance capability of the fracturing fluid can reach above 200DEG C; and the fracturing fluid has the characteristics of cross-linking delaying, low frictional resistance, good cross-linking performance, strong temperature and shear resistance, low filter loss, thorough gel breaking, low residue content, good expansion resistance and the like.

The invention relates to the technical field of fracturing and production increasing of an oil well or natural gas well, and in particular relates to a low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of a low permeability gas reservoir and a preparation method of the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid. The low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid of the low permeability gas reservoir contains the following components in parts by weight: 100 parts of base solution, 0.2-0.5 part of cross-linking agent, 0.03-0.04 part of gel breaker, and liquid nitrogen, wherein the liquid nitrogen accounts for 5-7 percent of total volume of the base solution and the cross-linking agent. The base solution, the cross-linking agent and a gel breaker are pumped into an underground fracturing stratum, and the liquid nitrogen is pumped, the base solution, the cross-linking agent, the gel breaker and the liquid nitrogen are mixed uniformly on the underground fracturing stratum, thus the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid reaches the purpose of fracturing operation, and has the advantages of low content of residue after fracturing, good gel breaking property, rapid flowback, little damage to reservoir stratum water, and good fracturing effect. According to the low damage carboxymethyl hydroxypropyl guanidine gum foam fracturing fluid, the production cost is lowered, and the working efficiency is increased.

The invention discloses a supramolecular fracturing fluid system for imbibition oil recovery and application of the supramolecular fracturing fluid system for imbibition oil recovery. The supramolecular fracturing fluid system for imbibition oil recovery is composed of the following components in percentage by weight: 0.2-0.7% of a supramolecular fracturing fluid thickener, 0.05-0.6% of a double-effect agent, 0.05-2% of a clay stabilizer, 0.05-0.4% of an efficient gel breaker and the balance water. The produced supramolecular fracturing fluid system for imbibition oil recovery is used for imbibition oil recovery work of a low-permeability tight oil reservoir, not only can the produced supramolecular fracturing fluid system for imbibition oil recovery be used as fracturing fluid for fracture forming and sand carrying, but also gel breaking liquid of the produced supramolecular fracturing fluid system for imbibition oil recovery can be used as imbibition liquid for changing the wettability of a reservoir matrix and reducing oil-water interfacial tension, and when imbibition oil recovery is conducted on the reservoir, through a method of combining fracturing and imbibition, not only is the imbibition recovery efficiency of the low-permeability tight oil reservoir improved, but also the problems that fracturing flow-back fluid is hard to treat, the recycling rate is low, and resources are wasted are solved.

The invention discloses a juice pressing device of a colorful noodle maker. The top of the juice pressing device is provided with a feeding inlet, and one end of the juice pressing device is provided with a residue discharge outlet fixedly provided with an end cover through threads; a main shaft B inside the juice pressing device is driven through a driving device. According to the above structure, the juice pressing device of a colorful noodle maker presses vegetable juice out, and compared with juice squeezed by a juice extractor, the juice pressing device of a colorful noodle maker can effectively reduce the residue content in the juice, thereby guaranteeing the taste of colorful noodles.

The invention provides a method for preparing an acid liquid system. The method comprises the following steps: 1) adding a thickening agent into a hydrochloric acid solution at a first stirring speed,and stirring at a second stirring speed to obtain a first acid liquid; 2) sequentially adding an iron ion stabilizer, a corrosion inhibitor and a demulsification cleanup additive into the first acidliquid, uniformly stirring at a third stirring speed, and standing to obtain a base solution; and 3) adding a tackifier into the base solution, and stirring at a fourth stirring speed to obtain the acid liquid system.

The present invention relates to a fresh ginger juice production device. The fresh ginger juice production device comprises a loading system, a water washing system, an air drying system, a material pouring system, a material cutting system, a screening system, two material loading systems, a material crushing system and a juice squeezing system. Fresh gingers are subjected to high-temperature cooking and soaking in the water washing system, so that dust, residues and other materials on surfaces of the fresh gingers are washed away together, at the same time, various harmful micro-organisms carried on the surfaces of the fresh gingers are effectively killed in a large amount, at the same time, during a drying process, taken-away water takes fine residues and impurities away together, and finally, a shaking work of the drying system ensures that the whole fresh gingers are clean and free of impurities. The fresh gingers are successively treated by the material cutting system, screeningsystem and material crushing system into fresh ginger blocks of a same uniform size range and a small size, which maximally increases a contact specific surface area of the fresh ginger raw material,at the same time also enables the fresh ginger raw material not to produce unnecessary deterioration due to excessive processing to affect subsequent products.